15... d7e5 A new move. 16. h2h3  16... e5f3  17. e2f3 [%c_effect f3;square;f3;type;GreatFind;persistent;true] Normally this capture isn't desirable for White, but here the e-file and the better development justify this move. 17... e8e1 [%c_effect e1;square;e1;type;Inaccuracy;persistent;true]